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参数资料
| 型号： | MAX8677CETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/21页 |
| 文件大小： | 0K |
| 描述： | IC USB/AC ADP CHARGER 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
19-0781; Rev 0; 4/07
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
General Description
The MAX8677C is an integrated 1-cell Li+ charger and
Smart Power Selector? with dual (DC and USB) power
inputs. It can operate with either separate inputs for
USB and AC adapter power*, or from a single input that
accepts both. All power switches for charging and
switching the load between battery and external power
are included on-chip. No external MOSFETs are
required.
The MAX8677C features a Smart Power Selector to
make the best use of limited USB or adapter power.
The battery charge current and input current limit are
independently set up to 1.5A and 2A, respectively.
Input power not used by the system charges the bat-
tery. USB input current can be set to 100mA or 500mA.
Automatic input selection switches the system load
from battery to external power.
Other features include overvoltage protection (OVP),
charge status and fault outputs, power-OK monitors,
charge timer, and battery thermistor monitor.
Additionally, on-chip thermal limiting reduces the battery
Features
o Complete Charger and Smart Power Selector
o No External MOSFETs Required
o Common or Separate USB and Adapter Inputs
o System Operates with Discharged or No Battery
o Automatic Adapter/USB/Battery Switchover
o Load Peaks Over Adapter Rating Are Supported
by Battery
o Input Overvoltage Protection to 16V
o 40m Ω System-to-Battery Switch
o Thermal Regulation Prevents Overheating
o PREQ , CHG , DOK , UOK , and FLT Indicators
o 4.35V (typ) SYS Regulation Voltage
Ordering Information
charge rate to prevent overheating. The MAX8677C is
available in a 4mm x 4mm, 24-pin TQFN-EP package.
Applications
PART
MAX8677CETG+
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
24 TQFN-EP**
(4mm x 4mm)
PKG
CODE
T2444-4
PDAs, Palmtops, and Wireless Handhelds
Smart Cell Phones
Portable Media/MP3 Players
GPS Navigation
Digital Cameras
+Denotes a lead-free package.
**EP = Exposed paddle.
Pin Configuration
18
17
16
15
14
13
Typical Operating Circuit
CHG 19
SYS 20
12 THM
11 ISET
AC
ADAPTER
DC
Q1
MAX8677C
CHARGE
CURRENT
SYS
LOAD
CURRENT
SYSTEM
SYS 21
DOK 22
UOK 23
MAX8677C
10 CT
9 GND
8 VL
LOAD
FLT 24
7 PSET
USB
USB
Q2
Q3
BAT
1
2
3
4
5
6
CHARGE AND
SYS LOAD
SWITCH
BATTERY
TQFN
(4mm x 4mm x 0.8mm)
GND
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
*Protected by U.S. Patent #6,507,172.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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